Python 2.7 reached end-of-life in 2020. At this point all of the major Python projects, including packaging and installation tools like setuptools and pip, have dropped support. Dropping support for Python 2.7 will accelerate development of the Python driver and dramatically reduce the maintenance burden.

Note that the 3.x branch of PyMongo, which supports Python 2.7, will continue to receive bug fixes until the second half of 2022.